在checkable视图中的setChecked()方法在每次扰乱布局时触发两次

Question

我在加州理工学院lab3 (http://sites.google.com/site/androidappcourse/labs/lab-3)工作，一切都正常工作，直到我实现了扩展和折叠项目的checkable接口。然后看起来我的逻辑是正确的(因为展开按钮文本仍然在改变)-但是布局没有正确地重新绘制-就像它应该展开时被折叠并且看起来破碎了。

在玩了一点点日志记录之后，我发现每次我点击任何项目setChecked()方法在很短的时间跨度内对每个项目调用两次-这与绘图混淆。第一次使用旧的选择数据-然后使用新的。

更奇怪的是，我设法通过设置setChecked()只在每隔一次触发来解决这个问题:

public void setChecked(boolean checked) 
{
    counter++;
    if (counter%2==0)
    {
        if(checked) expandJokeView();
        else collapseJokeView();
    }
    Log.d("SimpleJokeListLog", "SetChecked"+" "+checked+" "+counter+" "+m_joke.toString());
}

下面是它在目录中的样子:我开始活动，显示列表与项目在我的自定义JokeView实现checkable

12-18 02:58:16.598: D/SimpleJokeListLog(742): SetChecked false 1 A small
12-18 02:58:16.628: D/SimpleJokeListLog(742): SetChecked false 1 Cartoonist
12-18 02:58:16.648: D/SimpleJokeListLog(742): SetChecked false 1 I wonde
12-18 02:58:16.728: D/SimpleJokeListLog(742): SetChecked false 2 A small
12-18 02:58:16.748: D/SimpleJokeListLog(742): SetChecked false 2 Cartoonist
12-18 02:58:16.748: D/SimpleJokeListLog(742): SetChecked false 2 I wondere

我选择第一项(A small…)

12-18 02:59:17.628: D/SimpleJokeListLog(742): SetChecked false 3 A small 
12-18 02:59:17.628: D/SimpleJokeListLog(742): SetChecked false 3 Cartoonis
12-18 02:59:17.628: D/SimpleJokeListLog(742): SetChecked false 3 I wondere
12-18 02:59:17.838: D/SimpleJokeListLog(742): SetChecked true 4 A small boy
12-18 02:59:17.847: D/SimpleJokeListLog(742): SetChecked false 4 Cartoonist
12-18 02:59:17.858: D/SimpleJokeListLog(742): SetChecked false 4 I wondered

选择第二个

12-18 02:59:24.768: D/SimpleJokeListLog(742): SetChecked true 5 A small boy 
12-18 02:59:24.768: D/SimpleJokeListLog(742): SetChecked false 5 Cartoonist 
12-18 02:59:24.768: D/SimpleJokeListLog(742): SetChecked false 5 I wondered w
12-18 02:59:24.968: D/SimpleJokeListLog(742): SetChecked false 6 A small
12-18 02:59:24.968: D/SimpleJokeListLog(742): SetChecked true 6 Cartooni
12-18 02:59:24.978: D/SimpleJokeListLog(742): SetChecked false 6 I wonde

第三个

12-18 02:59:27.828: D/SimpleJokeListLog(742): SetChecked false 7 A small
12-18 02:59:27.838: D/SimpleJokeListLog(742): SetChecked true 7 Cartoonis
12-18 02:59:27.838: D/SimpleJokeListLog(742): SetChecked false 7 I wonder
12-18 02:59:28.048: D/SimpleJokeListLog(742): SetChecked false 8 A small 
12-18 02:59:28.058: D/SimpleJokeListLog(742): SetChecked false 8 Cartooni
12-18 02:59:28.068: D/SimpleJokeListLog(742): SetChecked true 8 I wondered

第三个(即使这次没有计数器，它也不能正常绘制):

12-18 02:59:31.197: D/SimpleJokeListLog(742): SetChecked false 9 A small b
12-18 02:59:31.197: D/SimpleJokeListLog(742): SetChecked false 9 Cartoonist
12-18 02:59:31.197: D/SimpleJokeListLog(742): SetChecked true 9 I wondered 
12-18 02:59:31.417: D/SimpleJokeListLog(742): SetChecked false 10 A small bo
12-18 02:59:31.417: D/SimpleJokeListLog(742): SetChecked false 10 Cartoonist f
12-18 02:59:31.427: D/SimpleJokeListLog(742): SetChecked true 10 I wondered why

Answer 1

我被困在这个问题上最后3或4个小时，最后我试图从扩展和崩溃方法中删除setChecked()调用(不记得为什么我把它们放在那里…)。也许它对你有帮助，这里是我的代码片段:

private void collapseRow() {
    mText.setMaxLines(2);
    mText.setEllipsize(TruncateAt.MARQUEE);
    mExpand.setText(COllAPS);
    mWiki.setVisibility(GONE);
    requestLayout();
    state = COLLAPSED;

}
private void expandRow() {
    mText.setMaxLines(Integer.MAX_VALUE);
    mText.setEllipsize(null);
    mExpand.setText(EXPAND);
    mWiki.setVisibility(VISIBLE);
    requestLayout();
    state = EXPANDED;
}
private void setData() {
    mText.setText(mItem.getDate());
}
@Override
public boolean isChecked() {
        Log.d("isChecked", "!!!!!!!");
        return mChecked;
}
@Override
public void setChecked(boolean state) {
    count++;
    if (state)
        expandRow();
    else
        collapseRow();
    Log.d("setChecked", ""+ state + "" + count);
}
@Override
public void toggle() {
    Log.d("toggle", "!!!!!!!");
    setChecked(!mChecked);
}

现在，所有的工作都很完美:没有多次调用setChecked，并且ListItems像它们应该的那样打开和关闭。